linux-kernel - Re: [PATCH] mm/migrate: Fix NULL movable_ops if CONFIG

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Message-ID: <202508160823.9dRNF1Rc-lkp@intel.com>
Date: Sat, 16 Aug 2025 08:57:27 +0800
From: kernel test robot <lkp@...el.com>
To: Huacai Chen <chenhuacai@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Harry Yoo <harry.yoo@...cle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/migrate: Fix NULL movable_ops if CONFIG_ZSMALLOC=m

Hi Huacai,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Huacai-Chen/mm-migrate-Fix-NULL-movable_ops-if-CONFIG_ZSMALLOC-m/20250815-170745
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250815090539.1578484-1-chenhuacai%40loongson.cn
patch subject: [PATCH] mm/migrate: Fix NULL movable_ops if CONFIG_ZSMALLOC=m
config: sparc-randconfig-001-20250816 (https://download.01.org/0day-ci/archive/20250816/202508160823.9dRNF1Rc-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250816/202508160823.9dRNF1Rc-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508160823.9dRNF1Rc-lkp@intel.com/

All errors (new ones prefixed by >>):

   sparc-linux-ld: mm/zsmalloc.o: in function `zs_init':
>> mm/zsmalloc.c:2250:(.init.text+0x8): undefined reference to `zsmalloc_mops'
>> sparc-linux-ld: mm/zsmalloc.c:2250:(.init.text+0xc): undefined reference to `zsmalloc_mops'


vim +2250 mm/zsmalloc.c

  2246	
  2247	static int __init zs_init(void)
  2248	{
  2249	#ifdef CONFIG_MIGRATION
> 2250		movable_ops[MOVABLE_ZSMALLOC] = &zsmalloc_mops;
  2251	#endif
  2252	#ifdef CONFIG_ZPOOL
  2253		zpool_register_driver(&zs_zpool_driver);
  2254	#endif
  2255		zs_stat_init();
  2256		return 0;
  2257	}
  2258	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki